Carriage shift control mechanism



Jan. 2, 1945. H, T. AVERY 2,366,429

CARRIAGE SHIFT CONTROL MECHANISM Filed Aug. l2, 1940 14 Sheets-Sheet 1FIEJ" QOOOOOOQOOOOOQQQO .NUN

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JARRIAGE SHIFT CONTROL MECHANISM Filed Aug. 12, 1940 14 Sheets-Sheet 3yWurz/whoa, HAQQL@ TAVE/QY Jan. 2, 1945. H. T` AVERY l 2,366,429

CARRIAGE SHIFT CONTROL MECHANISM Filed Aug. 12, 194Q '14 Sheets-Sheet 4FIS- E5- 3 n vvv/YM HAPULD TA1/[QV Jan. 2, 1945. H. T. AVERY 355,429

CARRIAGE SHIFT CONTROL MECHANISM Filed.v Aug. l2, 1940 14 Sheets-She't 5Jan. 2, 1945. H. T. AVERY CARRIAGE SHIFT CONTROL MECHANISM Filed Aug.12, 1940 14 Sheets-Sheet 6 c .HAPQLD T VEQY -md -muwrmn Jan. 2, y1945.H, 'T AVERY CARRIAGE SHIFT CONTROL MECHANLSM A Filed Aug. 12, 1940 14Sheets-Sheet 7 Jan. 2, 1945. v H. T. AVERY 2,355,429

CARRIAGE SHIFT CONTROL MECHANISM 'Filed Aug. 12, 1940 14 sheets-sheet awuz/whom HAQOLD 7341/505/ Jan. 2, 1945 Y H T, AVERY 2,366,429

CARRIAGE SHIFT CONTROL MECHANISM Filed Aug. l2, 1940 14 SheetsmSheet 9Jan, 2, 1945.

H. T. AVERY l CARRIAGE SHIFT CONTROL MECHANISM Filed mig. 12, `1940` 14Sheets-Sheet 10 Flan-@E3 /51/ /sza we /562 /m w47 Jan. m5.

H. T., AVL-:RY 2.366,429

CARRIAGE SHIFT CONTROL MECHANISM Filed Aug. 12, 1940 14 sheets-sheet 11LET' .I, E .E E

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CPRRIAGE SHIFT CONTROL MECHANISM Filed Aug. 12, 1940 14 She'eS-Shee; l2

HA/eom TA1/59V @labor/14W Jan. 2, 1945*. H, T AVERY 2,366,429

CARRIAGE SHIFT CONTROL MECHANISM Filed Aug. 12, 1940 14 sheets-sheet sFLE- E QL..

INVENTOR. #www Z ,Aa/QV ATTORNEY Jan. 2, 1945. H. T. AVERY CARRIAGESHIF'JE CONTROL MECHANISM Filed Aug. l2, 1940 14 Sheets-Sheet LLL!lINI/ENTOR, HAMA@ 7.` AVERY WAV/- ATTORNEY.

^ Patented Jan. 2, 1.945

UNITED STATES CARRIAGE SHIFT CONTROL MECHANISM Harold T. Avery, Oakland,Calif., assignor to Marchant Calculating Machine Company, a' corporationof California Applieeneu August 12, 1940, serial Nu. 352,289

11 Claims.

trol the carriage shifting mechanism of a calculating 'machine inaccordance with the type of,

calculations performed thereby.

Another object is to selectively control the direction of carriageshiftduring one type of machine calculation and to automatically render suchcontrol ineffective during a different type y of machine calculation.

Another object is to automatically render the shift controllingmechanism ineffective during additive or subtractive operation.

Another object is to selectively predeterminethe direction of automaticcarriage shift during a machine calculation or to render the carriageshift ineffective.

The present invention ls disclosed herein in its preferred form asembodied in the commercially knownMarchant calculating machine of thetype shown in the copending Avery Patent 2,271,240 issued'on January 27,1942, of which the present application is a continuation-impart.

Y This application is also a continuation-impart of the copending Averyapplication Serial Num-- ber l02,949,flled December 18, 1933, `and sincematured inte Patent Number 2,211,738, issued August 13, 1940.

Reference may be had to the above mentioned patents for a completedisclosure of the present calculating machine including mechanism notspecifically disclosed herein; it being noted that parts shown herein towhich reference numerals are applied, but which are not described indetail, willbe found to bear the same reference numerals in saidpatents. It is to be understood, however, that the invention is not tobe regarded as limited in application to machines or mechanisms of thetype set forth in the above men-v tioned patents. For. example, althoughthe invention is shown as applied to a machine in which a shiftablecarriage supports the accumuiator'and counter'registers for movementrelative to actuating mechanism therefor, the invention may also beuseful in calculating machines wherein (ci. zas-s3) the registers arestationary and the actuating mechanism is shlftable relative to theregisters.

With a calculating machine embodying the prsent invention, it ispossible to reduce the amount of time and effort on the part of theoperator in conditioning the machine for a problem. Thus, if the machineis set to effect an automatic carriage shift in a certaindirection, orto prevent such automatic shift during multil0 f to effect division willautomatically supersede such shift or non-shift, control so as to renderthe same ineective, and effect carriage shifting in the directionrequired in performing the division operation. After the divisionoperation is completed, the former shift or non-shift control will beautomatically reenabled. o

Also, if the calculating machine is set to con` trol a carriage shift ina certain direction automatically in multiplication, this control may berendered ineffective during single or multicycle addition or subtractionoperations upon the manipulationfof the proper'controls for effectingsuch operation.

manner in which the above and other objects of the inventionareaccomplished, will be readily seen on reference to the followingspecification when read in conjunction with the accompanying drawings,wherein- A `Figure 1 is a plan view of a calculating machine embodyingthe present invention and showing the location of the various controlstherefor. Figure 2 is a sectional view in side elevation of thecalculating machine. u

Figure 3 isa section taken along the line 3 3 of Figure 2 showing thetypical construction and mounting ofthe keys. 'L Figure 4 is a sideyelevation illustrating the mechanismfor controlling the dipping of aportion of the shiftable carriage.

Figure 5v is a sectionalview illustrating mechanism; for effectingrelease of the dipping portion of the carriage from its dipped position.

Figure 6 is a sectional view illustrating the mechanism for clearing thekeyboard either manually or automatically.

mechanism for determix'ling` single or plural cycle i operationselectively. l

, Figure 8 is a vertical sectional view through the multiplier unit,illustrating the multiplier selection mechanism. i

plication, manipulation of thedivision controls" Further examples oftheadvantages and time` Figure 'l is' a sectional view illustrating theFigure 9 lis a detail view of the selection segment illustrated 'inFigure 8.

Figure l is a sectional view taken on line Figure l1 is a verticalsectional view of the multiplier unit.

Figure 12 is a detailed view of one of the multiplier keys. f

Figure 13 is a sectional view illustrating mechanism for automaticallycontrolling the termination of the multi-cyclic operation initiated byone of the multiplier keys.

Figure 14 is a sectional view taken on the line |4-I4 of Figure 13.

Figures 15 and 16 illustrate details of construction of certain leversshowny in Figure 1l.

Figure 17 is a sectional view showing the restore clutch and mechanismfor controlling this clutch.

Figure 18 is a section taken on line |0-I0 in Figure 17. f

Figure 19 is a side view' illustrating the construction of the supportfor the addition and su traction bars.

Figure 20 is a sectional view illustrating mechanism operated by theaddition and subtraction bars.

Figures 21 and 22 are detail views also showing mechanism operated bythe addition and subtraction bars. n

Figure 23 is a sectional side elevational view showing certain of themechanism utilized for effecting a power shift of the carriage.

Figure 24 is a sectional view taken substantially on line 24-24 ofFigure 23.

Figure 25 is a detail view ofv part ofthe shift controlling mechanism.

Figure 28 yis a sectional side view illustrating part of the mechanismfor automatically controlling the carriage shifting mechanism.

Figure 27 is a detailed sectional view of the setting clutch and controlmember therefor.

Figure 28 is a sectional view of part of the mechanism for controllingoperation of the main clutch and for effecting release of the keyboard.

Figure-29 is a sectional view illustrating the keys for controlling thedirection of automatic shift and also the non-shift key and mechanismemployed for disabling'the automatic shift.

Figure 30 is a sectional view of the trip mech- -anism illustratedinFigure 29;

lpredetermining the direction ot, carriage shift during divisionoperation.

Figure 34 is a schematic developed view showing the relationship betweenvarious units of the calculating machine'.

Figure 35 is a sectional view of'a modified form oi' Ashift andnon-shift control for the carriage.

Figure 36 illustrates still another modified form of shift control forthe carriage.

Manually set selectonmchanism The present invention is disclosed asembodied in ya machine of'the key-set type in which means are providedfor ilrst setting one factor of a calculation upon a keyboard andsubsequently operating the machine in a manner indicated by thecharacter and amount of another factor of the calculation.

As viewedin Figure 1, the various value selectingkeys |00 are arrangedin a series of parallel banks of nine keys each, the number of suchbanks provided depending upon the magnitude of the factors with whichthe machine is designed to deal. Each key bank comprises a channelshaped key frame |0| (Figures 2 and'3) in which the key stems |03 of thevarious keys |00 are slidably mounted. Compression springs |02 areprovided to normally maintain all of the keys |00 in a raised position.

All of the key stems |03 are of the same length and each has a camextrusion ||3 which, upon depression of the associated key, pushes totheright, as viewed in Figurel 2, a slotted key locking slide 'slidablysupported on the lower side of the channel |0| by rivets, therebyreleasing any other latched down key in the samel keyv section. Upondepression of any value key stem, the slide ||1 is returned to itsinitial location by spring H0, and by overlapping the upper end of theextrusion H6, latches the depressed key.

Disposed beneatli the value keys |00 in each bank is a differentiallysettable bar |20 (Figure 2) which is pivotally suspended from the keysection frame |0| by means of two parallel links |20 and |20. This bar|20 has nine identical divergent notches |30, each of which terminatesin a rectangular slot |3| proportioned to receive the end of theassociate key stem |03 so that 4the bar |20 will be accuratelypositioned. The key stems |03 are spaced an equal distance apart andthis distance is slightly greater than the spacing between successiveslots |3| so that each succeeding slot |3| will be spaced one incrementfurther away from its cooperating key stern. Thus depression of a valuekey will cam the bar |20 to the right a number of increments equal tothe value represented by the depressed key.

Such movement of eachof the bars |20 is utilized to set up a mechanicalrepresentation of the selected value to control the actuatingV mechanismaccordingly, and for this purpose a swinging segment member |32 isconnected by means of a pin and slot connection |03 to each bar |20, andis pivotally mounted on a common shaft |31 extending across the machineand supporting like members associated with other key banks. Each of thesegment members |32 is provided at opposite ends thereof with arcuateracks |30 and |30, which serve to transmit the movement of thedifferential bar |20 respectively, to a pinion |40 of a check dialassembly |40 rotatably mounted on a shaft |4|, and through a gear |5I toa cam unit |46 which is positioned by such movement to form a mechanicalrepresentation of the value set up on the selected key bank.

Each cam unit |46 comprises a gear |0| and five cams, one of which isshown at |02. Each one of the cams has two high points |00 and two lowpoints |6| on its periphery. The cams are so staggered that nohigh orlow point on one cam is aligned with a high or low point on another cam.

As is described in detail in the above mentioned Avery Patent 2,271,240,the various cams on the cam unit |40 are so arranged that upondepression of a value key |00he gear 0| meshing with the arcuate, rack|33 will rotate the cam unit |40 to a position wherein one of the highpoints of fone of the cams will `be positioned in the path of a nose 2||of one of a set of five feeler arms 2|0 on one side of the cam unit |46.or in the path of a nose 2|9 of one of a set of five feeler arms 2|1 onthe opposite side of the unit |46.

Power set selection mechanism bar 800, the subtract bar 860, thedivision key4 910, or one of a plurality`ofl multiplication control keys200|, a setting clutch dog 394 (Figure 27) is rocked counter-clockwisebymechanism to be described hereinafter to effect engagement of acyclically operable setting clutch 430, the. details of which aredisclosed in the above mentioned Avery patents.' Upon engagement of thesetting clutch 430,power derived from a motor (not shown) is transmittedthrough the clutch to y a setting clutch shaft 43| (see al'sorFigure 2)yKeyed on the setting shaft A43| are a number of pairs of complementarycams identical lto cams j 220 and 22| (Figure 2), and each pair has anassociated cam follower 224, pivoted on a cross rod the cam supportingshaft |59 by the remaining cams, be held in their respective medialposition causing their upper slotted ends to assume a positionsubstantially as shown in Figure 2.

Each lof the feeler arms 2|0 is connected through a pin and slotconnection 206 with a plate |12 pivotedon a sleeve |69 which isrotatable about ashaft |10. Arranged on each plate |12 is a set of gears|14 and |13, meshing with a laminated gear |89 mounted on the sleeve|68.

From the above it will be seen that four of each groupfof five of theselection plates |12 will'be held in a medial position, while the fifthwill be moved forward or rearward until the lowermost gear |13 thereonmeshes with an aligned gear |15 on a shaft- |66 or an aligned gear |16on a shaft Y Gear |15 is one of'a. g'roup of four gears |11 (Figureli)keyed on the shaft |66 and adapted, to

mesh with gears on ffour of the selection plates and 200, respectively?keyedon a third shaft |88.

The shafts |66, |61,and ,|68 are connected to a cyclically operable mainclutch 428 (Figures I 28 and 34) in a manner to'be described presently,

225, and provided with 'a roller 222 in engagement with the cam 220-anda second roller 228 in engagement with the cam' 22|. As the shaft 43rotates, the cam followers 224 arev rocked in a clockwise direction and,through links 226, impart a counter-clockwise rocking movement' to aseries oflevers 2|4 rockably mounted on a shaft 2li.

A shaft 2|3 supported' by the lever 2|4 has pivotally mountedthereon thegroups of feeler arms 2| U-hereinbefore described, one of these groupsbeing located adjacent each ofthe cam units |46. During the leftwardmovement of the feeler arms 2|0 bythe shaft 2|3, each of the noses 2| i,formed on the feeler arms 2|0, engages the periphery of the respectivecam on the cam unit |46.v thereby causing each` feeler'arm 2|0 to pivotabout the point of contact between its respective nose and the peripheryof its associated am. The balance of the forward movement of t 'e shaft2l3 by the cam followers 224 effects forward movement of the lower endof the feeler arms' 2|0 and this movement is transmitted through alink,2|8 to rocka second feeler arm 2|1 aligned with each of 'the feelera'rms 210, The arms 2| 1 rock in a. y clockwise direction about a fixedshaft 2|8 until their noses 2|9 engage the periphery of the respectivecam at a point substantially diametrically opposite to that ngaged bythe nose 2|| of the associated feeler arm 2|0. i

As was described hereinbefore, each of the cam ciated pairs of feelerarms 2|0 and 2|1 will'have their respective noses in engagement with the1 high or lo'w points of a cam at any one setting rocked a considerableangle about its supporting shaft 2|3 to one'side" or the other of amedial so that the shaft |66 rotates through a 180 for l each cycleA ofoperation-of the clutch 428, and

of the various gears ingthe two gear groups |11 and |18, correspondingto each keyboard order, are'so arranged that for each machine cycle, the

gear- |89 (Figure 2) will'be rotated by one Vof the gears of the group|11 and |18, a number of increments correspondingy to the value of, thekey `|00 which is depressed duringthe machine cycle.

If no key is depressed, the selection plates |12 will be so arrangedthat none of the gears in either of the groups |11 and |18 will becomeoperative to drive the gears |18.

' Means are provided for locking the selection plates |12 in any oftheir three operative positions and comprises a lock bail 238 (Figure2)` which extends across all `orders of the machine and is pivotedat231. This bail is connected by means lof a link 528 to a cam follower629 having Irollers 530 and 53| thereon in engagement with units |46 isso arranged that only one of the asso..

Y 3|8 inthe cover of the carriage 250. Suitable y position, indicatedvin Figure 2, ydepending upon whether its nose 2|| isin engagement witha` 4'their noses are held the same distance apart from complementarycams 526 and 621, respectively, secured to the setting shaft 43|. f

` Carriage dipping At the start of aV machine cycle, and in advanceoffrotation of the. gears |89, a gear 21| (Fig. ures 2 and 4) having agear 213 of the accumu- Iviator' register mechanism in mesh therewith,is "dippedunder control of the setting shaft 48| to mesh with the gearsI 89 and thereby transmit rotation to numeral dials in the accumulatorregister which dials are visible'through openings tens carryingmechanism (not shown) is provided as -disclos'ed in detail in the abovementioned Avery Patent 2,271,240. f

As shown in Figure 4, the shafts, 210 and 212 supporting the gears 213and 21|, respectively. are

mounted on a seriesA of plates `288 pivoted on a lcross rod 282 carried.by carriage support platea (not shown) and are secured 'attheirrightmost;

ends, as viewed in Figure 4, to a common bail 269 which extends vbetweenrollers 568 mounted on vertically extending links 566. These links areslidable over pins 561 and are biased upwardly by a tension spring 569.These links 566 are hinged to cam levers 510 by pins 512, which leverscarry rollers 513 in engagement with cams 514 on the setting shaft 43|so that the links 568 are positively pulled down by the setting clutchrotation to engage the gears 21| with the gears |89.

After the above mentioned portion of the carriage 250, including thegears 21| and 213 is dipped,. it is locked in this position by latches515 pivoted at 516 and each having a nose 511 formed at the upper endthereof to engage ears 518 on the cam levers 510. Springs 519 urge thelatches into engagement with the ears 518. Means are provided to releasethe dipped portion of the carriage at the end of a, main clutchoperation and comprises levers 580 and 584 (Figure 4 and 5) secured to ashaft 58| and cooperating with a lever 59| pivotally mounted on a shaft590 and provided with an extension 592 lying against the lever 584. Asecond extension of lever 59| is adapted to be engaged by a roller 593fixed to a supporting disc 100a secured on a sleeve 594 which is drivenby a restore clutch 100 (Figures 4 and 17), the control of which will bedescribed hereinafter.

A cam 596, also driven by the restore clutch 100, is provided to preventthe dipping portion of the carriage from rising too rapidly under theaction of the tension spring 569. A cam follower 591 is fixed to arockable shaft 800, which shaft has also affixed thereto arms 599connected by pin and slot connections 602 to the vertical links 566.Thus, the rise of the link 566 is controlled by rotation of the restoreclutch 100 under the action of the springs 588.

Main clutch operation The main clutch 428 (Figures 28 and 34) is engagedupon operation of the setting clutch 430.

Clutch 428 is driven from the motor (not shown) through suitable gearingentrained with a gear 4|5 mounted on the driven side of the clutch. Thedriving side of clutch 428 is connected to shafting 429 to which issecured a gear 458 meshing with a gear 484 mounted on the hereinbeforementioned shaft |66. The shaft |81 is entrained with the shaft |66through gears 485, 486, and

tensioned between a frame stud and the left end of thedog 885 througha.` toggle link arrangement 6|0.

To effect rocking` of the clutch dog 385 by the setting shaft 43| a cam141 is mounted on the setting shaft and is engaged by a roller 145mounted on a, cam follower 148 fulcrumed on a shaft 50|. This camfollower 148 carries a member 603 pivoted thereon at 804 and urged torock clockwise lwith respect to member 148 by a spring 6|3, movementbetween the lever and the member 603 being limited by an ear 6|4 on themember 608 engaging the lower edge of the cam follower 148. The member808 is provided with av nose 6 I5 which may engage a notch 8|0 on theclutch dog 395 with a hooking action to rock the dog 395. outofengag'ement with the main clutch 428 to cause operation thereof.

To provide for continuous multi-cycle rotation of the main clutch 428for multiplication or multiple addition and subtraction operations, alatch 632 is provided, this latch being pinned to a rockable shaft 626and urged clockwise by a spring 633. A roller 634 is mounted on theupper end `of the latch 632 and is adapted to be engaged under a lateralprojection 620 on the main clutch dog 395 to hold the same out ofengagement with the clutch during multi-cyclic operation. However, foroperation performed during one cycle of the 'main clutch, such asaddition, subtraction, and multiplication by the number 1 as amultiplier, means hereinafter described are provided to prevent thelatch 632 from entering under the tail of the clutch dog 385.

Restore clutch The restore clutch (Figure 17) is employed to effectrelease of the heretofore mentioned carriage latch member 515 (Figure 4)and to control the rate of return of the dipping portion of the carriagefrom its dipped position, as well as to effect other functions to bedescribed hereinafter. This clutch is jointly controlled by dipping ofthe carriage and by the main clutch dog 395 in such a way that wheneverthe carriage is in its lowered position and the main clutch dog 395 isseat ed home in a notch in the main clutch, the restore clutch willoperate and complete one cycle of operation.

The lowering of the carriage creates a spring bias tending to move aclutch release dog 405 away from the restore clutch and permitengagement of the clutch, but as this dog is normally latched by amember 10| the spring is prevented from becoming effective untilcompletion of the main clutch cycle. The raising of the carriage isinitiated and controlled -by the restore clutch and this carriagemovement is utilized to reverse the spring bias on the restore clutchrelease dog so as to tend to return it home so that as the restoreclutch cycle is finished the clutch release dog is spring pressed intothe full cycle notch of the clutch housing bringing the restore clutchto rest upon completion of one cycle of operaton.

The restore clutch 100 is similar to that disclosed in the patent toFriden U. S. Patent Number 1.643,710 and is controlled by a nose 102 ona clutch release dog 405 which is pivotally supported on the shaft 600.

An M-shaped member 103, rockably mounted on the shaft 600, is providedto control the dog 405 and has a lug 104 thereon supporting a spring 105which is compressed between the lug 104 and an arm formed on the dog405.

An arm 122 is keyed to the shaft 600 and is consequently rocked bydipping movement of the carriage. This arm is resiliently connected tothe M-shaped` member 103 by a link unit 123 (Figures 17 and 18). Asappears in Figure 18, the link unit includes a link member 106 securedby a pin 108 to the arm 122, and another link 1| Ir secured by pin 1|2to the M-shaped member 103, the other end of each link being slotted asat 1|3 to receive the pins 109 and 1|2, respectively. Each link has acut-out portion into which tenons 1|4 and 1 I5 extend. A compressionspring 1 6 is slipped over the adjacent tenons in each link so that whenthe unit is pulled apart the spring is compressed, whilelikewise whenthe unit is compressed the spring is also compressed so that the springtends to maintain the link unit at a given and constantlength at alltimes.

As the setting clutch rotates. the main clutch compressed.

' 'I'he parts remain so positioned until the main dog 395 is withdrawnfrom contact with the main clutch and an extension 408 on said dog iswithdrawn from beneath a. latch member pivoted on a frame plate, thuspermitting said latch member to be rocked counter-clockwise by hitsspring 1|1 tensioned between one end thereof and the frame. An ear 1|8on said latch member is thereby brought into the notch 1|8 of theM-shaped member 103 to prevent counter-clockwise movement of 103 until`the main clutch has been disengaged byreseating of its dog 395 in one ofthe full cycle notches of the clutch 428.

The lowering of the dipping carriage, however, tends to engage therestore clutch even before the main clutch engages, and a secondrestraining means is provided to 'prevent such operation.

The addition bar 800 (Figure 19) is carried by a frame 80| which is'supported by parallel link mechanism formed by bell cranks 802, bothpivoted upon the machine frame. These bell cranks are connected togetherby a link 803. A spring 804 is tensioned between one of the bell cranksand the frame of the machine to hold the addition bar 800 in a raisedposition. The frame 80| includes a projection 805 overlying a pin 806carried by another parallel link arrangement (Figure comprising arms 801and 808 pivoted on studs 808 and 8| 0, and connected together by a link8| I.

Upon clockwise rocking of the levers 801 and 808 by depression of thebar 800, a shelf 126 A formed on the lever 808 is moved upwardly out Theleft foot of M-member 103 is provided with a shelf 120 overlying one endof a bell crank 12| which is rockably supported on a shaft 6| Theother'end of bell crank 12| is provided with a roller 101 lying againstthe periphery of a cam 108 on the setting clutch shaft 43|, On rotationof the setting clutch, therefore, the bell crank 12| is rocked and shelf120 is raised 'by the end of the bell crank to rock the M-shaped member103 slightly clockwise about the shaft 600. This raising of the member103.insures that the lug 1|8 of the latch member 10| will engage in thenotch 1|!) properly when the main clutch is en- Saeed.

As the setting clutch continues to rotate, the dipping carriage islowered and shaft 600 is rocked counter-clockwise by arms 589 (see alsoFigure 4) keyed thereto and connected with` the carriage lowering links566. Arm 122 (Figure 17) of engagement with the face of a hatchet shapedlever 128. This lever 128 (Figures 2O and 2l) is pinned to a shaft 162,as is a second lever 160. A spring 130 is connected to the latter leverand rocks that lever, shaft 162 and lever 128 clockwise vwhen the lastmentioned lever is released from restraint of shelf 126. A short arm 132is likewise pinned to the shaft 162 and therefor, swings with the lever128 to move a pin 134 .(see also Figure 1l) to open the setting clutchand effect an additive operation through mechanism to be described inconnection with multiplication.

keyed to the shaft 800, is thus lowered, and since the M-shaped member103 is held first by the bell crank 12| and then by the latch member10|, the link unit 123 is lengthened and its spring 1|6 clutch dog 395is permitted to reseat in the notches of the clutch discs, whereupon theextension 408 thereof strikes the ear 1|0 of the latch member 10|,rocking it clockwise and removing its lug 1|8 from the notch 1`|8ofmember 103.

Spring 1|6 is then permitted to expand, shortenling the link unit 123and rocking the member103 counter-clockwise to 'carry the left leg ofmember 103, as viewed in Figure 4, down against the leftwardly extendingarm of bell crank 405 and move the restore clutch dog 102 to causeengagement of the clutch.

Operation of the restore clutch thus initiated,

causes the dlppingcarriage to rise, as previously4 descrlbed,'rockingarm 122 clockwise by virtue of its connection therewith. Movement of thearm if '122 is, in this operation, transmitted directly Addition barmechanism The addition bar 800 is ordinarily used for securing a singleadditiveoperation, but may be used for multiple addition' also ashereinafter disclosed. The bar 800 is capable, upon depression.

of initiating operation of the motor, the setting clutch 430, the mainclutch 428, release of all depressed value selecting keys |00 l(Figuresl and 2),

and release of the automatic carriage shift control.

After having been released by the shelf 126, the hatchet shaped lever128 is recocked by the cam 141 (Figure 28) on the setting clutch shaft43|, which cam rocks the hereinbefore mentioned cam `follower 146 towhich is connected a link 148.

Link 148 is also connected to an arm 150 pinned to a shaft 152 (Figures20 and 28). A lever 154 is also pinned to the shaft 152 and is connectedby a link 156 through a pin and slot connection 158 with the lower endof the lever 160 which is pinned t0 the same shaft 162 to which thehatchet shaped lever 128 is pinned. The pin and slot connection 158permits free clockwise movement of the hatchet shaped lever 128, butcauses this lever to be rocked counter-clockwise or recocked uponrotation of the setting clutch 141.

The hatchet lever 128, upon being recocked, is carried slightly'beyonditsoriginal position until a shelf 164 (Figure 20) on a pawl 166 pivotedon the shaft 8|0 and urged in a clockwise direction by a spring 168engages with a, shoulder -110 on the bottom edge of a link 142. Sincethe link 142 is connected with the upper end of' the hatchet lever 128,this lever is held in its extreme counter-clockwise position until suchtime as the shelf 126 is permitted to return to its locking positionrelative to the hatchet shaped lever. Thus, in the event that the bar800 is held depressed too long, the parallel links 801 and 808 will'rise freely upon release of the barv 800 without any possibility of theshelf 126 beingintercepted by the lever 128. As the lever 808 rises, itsupper edge engages an ear 112 on the tail of the pawl 166, thusreleasing the shelf 164 from the shoulder and permitting the hatchetmember to-move to its original position where it is blocked by the shelf126. Before the hatchet member is recocked this shelf 126 overrides itsupper edge to form anI interlock preventingrising of the parallel links801 and 808 which might otherwise occur prematurely.

Subtraction bar mechanism The subtraction bar 860 (Figures 1 and 19) isutilized for effecting a single cycle of negative operation or.forrepeated subtraction in connection with the multiplier keys 200|.

This bar 860 is mounted on a stem 06| slidable vertically on pins 062and normally held in a raised position by a spring 863. The stem 06| isprovided with a projection 864 which overlies the hereinbefore mentionedpin 006 and operates the mechanism associated .with that pin in the samemanner as was described in connection with the addition bar 800.However, depression of the subtraction bar 860 effects reverse controlof a main reverse unit (not shown) situated between the main clutch 428(Figure 34) and the gear 458. To eiect reversal of this main reverseunit,

. a lug 861 (Figures 19 and 20) is formed on the stem 88| of thesubtraction bar 860 and, upon depression of the bar, this lug engages anarm 140 pinned to a shaft '546, to which is also pinned the controlsdisclosed in detail in the aforesaid Avery patents, for the main reverseunit. The lug 881 cams-the arm 140 in a clockwise direction to likewiserock the shaft 546.

Keyboard release Upon depression of either the bar 800 or 860 andconsequent operation of the setting shaft,

all depressed value selecting keys will be automatically released bymechanism illustrated in Figures 6 and 20.

The hereinbefore mentioned parallel link arrangement comprising thelevers 801 and 808 and link 8|| comprises a pivot pin 118 Whichvslidablysupports one end of a link 119 which has a slot adjacent its right handend and embracing this pin. The left hand end of the link 119 isbifurcated to embrace a pin 18| mounted on a keyboard clearing bail |25extending across the machine. The bail |25 is pivoted at |26 and has anupwardly extending flange |21 located directly in iront of the variouskey latching slides-H1 (Figure 2). Whenever the bail |25 is rockedclockwise about its pivot |26, either by depression of a keyboard clearkey |22 or by leftward movement of the link 119, as viewed in Figure 6,the flange |21 engages all of the slides ||1 to move the same rearwardand'thereby release all latched down keys.

When the link 119 is loweredby depression of the addition bar 800, orsubtraction bar 060, with consequent lowering of the parallel linkarrangement comprising the levers 801 and 000, a lug 116 on the link 119is lowered into the path of an arm 114 pinned to the shaft 152. As wasdescribed in connection with the additionbar mechanism, the shaft 152 isrocked counter-clockwise upon rotation of the setting shaft 40| by themechanism illustrated in Figure 28, and the leftward movement of thelink 110, as viewed in Figure 6, caused by this counter-clockwise rock--ing of the arm114 eiects rocking of the ball |25 and releases al1depressed value selecting key |00.

When the bars 800 and 860 are allowed to remain in their raisedpositions the lug 116 on the link 119 is retained by spring 183 abovethe path of movement of the arm 114.

Automatic multiplier unit l20|0 which, in turn, drive gears 20|multiplier keys "2" to 9 values to move the selection segment |32mounted on the shaft |31 an amount proportional tothe value of themultiplier key depressed. The machine being normally conditioned for asingle cycle operation, no control of the multiplier selection by the 1"key is necessary. The segment |32 is substantially the same as the samemember disclosed in Figure 2, except that it does not have the uppersegment arm for setting a check dial.

The mechanism for swinging the member |32 is illustrated in Figures 8,9, and 10. A lever 2003 is pivotally mounted on a. shaft 2004 whichextends to the left of the key section 2002. A pin 2005 connects thelower end of lever 2003 with the diiferentially settable bar |20 and onits upper end lever 2003 is secured by a pin 2006 to a lever arm 2001.This arm 2001, as appears in Figure 10, is integral with an arm 2063welded to a bail member 2064 pivotally mounted on shaft 2004. One end ofthe bail member is extended to form another lever arm 2065 having abifurcated end embracing pin 2006 mounted upon the multiplier selectionsegment |32.: Thus, lever 2003 and the lever 2065 are in effect joinedas a single lever to rock about the common axis of the shaft 2004 sothat movement of the bar |20 will impart proportional movement to theselection segment |32.

As has been stated in connection with the manually set selectionmechanism, the swinging member |32 is likewise effective to rotate aselection cam unit |46 similar to that described in connection withFigure 2.

Y rIhe multiplier unit also includes sensing members 2| 0 and 2|1(Figure 8) which,l in the same way as has been disclosed in connectionwith the earlier described power set selection mechanism. are'eiectiveto sense the setting of the present cam unit |46 and, when the lockingbail 236 is released, to position the selection plates |12 cooperatingwith driven gears 2009 driving idlers The gears 2009 are. keyed to asleeve 20 2 supported by shaft |10, and the sleeve 20|2 is in turndriven by the Automatic predetermined multiplication may twelfth speedshaft |68 (Figure 13) through a gear train including gear 2025 on thetwelfth speed shaft |68, idler gear 2026, and idler gear 2021, anddriving gear 2028 on the sleeve 20|2.

Since the twelfth speed shaft is rotated whenever the main clutch isoperating, the gears 20I| (Figure 8) are driven thereby through theidlers 20|0 carried on the diil'erent selection plates |12. As has beendeveloped in connection with the previously described power setselection mechanism, any one of the group of plates may be selectivelymoved to engage the gear 20|| carried thereby with gears which, in thiscase, are

carried by sleeves rotatably mounted on the half and quarter speedshafts |66 and |61, respectively. Movement of these gears is utilized tocontrol the number of cycles of operation of the main clutch and therebyeilect a multiplication in all operations wherein the multiplier is twoor more. A l

The driven sleeve rotatably mounted upon the half speed shaft |66(Figure 14) carries gears 20|0, 20|4, 20|5, and 20|6 connected theretoas a Y unit. The driven sleeve rotatably mounted on the quarter speedshaft |01 carries gears 20|1, 20|0, and 20|! connected together as aunit. These gears are mounted upon the half and quarter speed shafts forthe sake of convenience and are not connected thereto. The gear 2020 isalso rotatably mounted upon the quarter speed shaft

